Hells Angel Arron Cluse found guilty of involvement in shooting of 11yo son of rival gang member at Semaphore home

A Hells Angels nominee is found guilty of a role in the shooting of a rival gang member's 11-year-old son.

Prosecutors said the shooting in Adelaide's north-west in September 2011 was part of an escalating war between rival gangs.

The prosecution said up to eight men smashed their way into the Semaphore home of former Fink and now Mongols gang member Mark Sandery, with four shots being fired at two of Mr Sandery's sons who were in bed.

One boy was shot twice in the leg.

Prosecutors told the Adelaide District Court it was a coordinated attack and 23-year-old Arron Cluse's role was to use a hammer to smash windows.

Cluse said he was at a Hells Angels meeting and had not even heard of Mr Sandery until after the shooting.

In his judgement, Judge Gordon Barrett found Cluse guilty of three charges, ruling that even though he did not have the gun, he must have known of the plan to fire it once at the house.

"I am satisfied that the common purpose of the group was to strike fear into the occupants of the house. It was a coordinated attack with that purpose," he said.

"I am satisfied that the plan agreed to by the group was to attack the house in various ways simultaneously.

"I am satisfied beyond reasonable doubt that [Cluse] knew that one, at least, of the group was going to go into the house prepared to fire a gun.

"In those circumstances the accused was part of a joint enterprise with the shooter to enter the house and endanger the lives of the two boys who were in the front bedroom."

Cluse's supporters cried after the guilty verdict was read out and some stormed from the courtroom.

Cluse will be sentenced later.

Editor's note (February 19): This story has been amended to clarify the nature of the charges Cluse was convicted of.